Untrue. Compressing the volume button of an iPhone 4 forces the bottom edge of the phone 2.5mm into the flesh of my thumb. (As tested with the thumb fully suppo

Untrue. Compressing the volume button of an iPhone 4 forces the bottom edge of the phone 2.5mm into the flesh of my thumb. (As tested with the thumb fully supported against a solid object. Free air is more complicated, since my thumb deflects backwards from the force but my brain attempts to compensate for that.) As for the screen touch, I find I hold the phone between the thumb and middle finger of each hand it is a "light grazing" with the index finger to take the shot… but I'd rather say "click"… usually.